Hi,
Upgrade could revert to previous system version but we can't perfrom revert to previous system version after clean installation of Windows Server 2016. Revert to previous system version is based on a Windows.old file which hold previous system data located in C drive. But it not exists in a clean installation system.
Resetting PC is also based on existing system version, reset will not change system version to others. So it not works for you.
What we need to do is performing clean install Windows 10.
Try to download Windows 10 ISO and perform clean install with a USB disk.
Here is a link for details step.
How to Install Windows 10, 8.1 or 7 Using a Bootable USB
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
Bests,
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